Assembly of the photocatalytic membrane having mesoscopic structure

清洁光伏能源的有效利用已成为世界范围内环境和能源问题中最重要的课题之一。二氧化钛(TiO2)是一种在光照下产生电子-空穴对的半导体材料，作为一种光催化体系引起了人们的广泛关注。其中一个很有前途的体系是两相二氧化钛-染料敏化体系。基于理论研究，发现具有介观结构的材料具有最高的光能利用效率。在本研究中，使用不同尺寸的小颗粒来制作二维高度有序结构(小颗粒阵列)模具。将具有光催化氧化还原能力的介观二氧化钛半导体用于处理各种环境问题，具体表现如下：1.利用介观二氧化钛半导体的光催化氧化还原能力解决环境问题。喷雾热解法制备高密度、高排列的二氧化钛介观结构及其堆积密度表征--结构为Fabr…采用喷雾热解的方法，控制溶胶浓度、喷雾速度、热处理温度。用扫描电子显微镜观察了制备的结构，并用傅立叶变换对堆积条件进行了表征。研究了二氧化钛介观结构的氧化还原能力--用硝酸银测试了预制结构的氧化还原能力。因此，在本研究中，通过对氧化聚合导电吡咯的扫描电子显微镜的分析，只考察了氧化能力的支撑。介孔大小相关物质分解的研究-通过改变结构的光催化反应中心的大小，考察了凝聚相对氧化还原能力的影响。预测由于凝聚相的分布和厚度以及核酸的带电性质不同，分解产物和制备物也不同，利用高灵敏的气相色谱仪进行了定量分析。对二氧化钛结构的选择性金属修饰--为了在氧化-还原反应的基础上获得高的光能转换效率，需要抑制在氧化位产生的电子和在还原位产生的空穴的复合。因此，对具有相似能带的金属进行修饰以促进电子运动是有效的。通过施加真空场，金属将只粘在球状反应部位。因此，常用的金属钯作为一种氧化和反应中心分离的材料被考察。较少

The effective applications of clean photovoltaic energy has become one of the most important project in the world-wide scale environment and energy problem. Titanium dioxide (TiO_2), a semiconductor with produces electron-hole pair under irradiation, has attracted much attention as a photocatalytic system. One of the promising system is a 2 phased TiO_2-dye sensitized system. Based on theoretical research, materials with mesoscopic structure are found to have the most efficient light energy use. In this present study, various size of small particles were used to fabricate a 2 dimensional highly ordered structure (small particle array) mold. The mesoscopic TiO_2 semiconductor with pthotocatalytic oxidation-reduction ability was used to deal with kinds of environmental problems.These are shown concretely below.1. Fabrication of the highly dense and highly arranged TiO_2 mesoscopic structure by spray pyrolisis method and the characterization of the packing density - The structure was fabr … More icated by spray pyrolisis method while the sol concentration, spraying rate, annealing temperature were controlled. The fabricated structure was observed by use of scanning electron microscopy and the packing condition was characterized by fourier transform.2. Investigation oxidation reduction ability of TiO_2 mesoscopic structure - The reduction ability of fabricated structure examined by silver nitrate has been reported. Therefore, in the present study, only the sustention of the oxidation ability are examined by analyzing the SEM of oxidatively polymerized conducting pyrrole.3. Investigation of meso-hole-size dependent substance decomposition - By changing the size of the photocatalytic reaction site of the structure, the effect of the condensed phase in the oxidation-reduction ability was examined. It was predicated that the decomposited and fabricated substance was different due to the distribution and the thickness of the condensed phase and the charge of nucleic acid, quantitative analysis was performed by using a highly sensitive gas chromatography.4. The selective metal modification on TiO_2 structure - To obtain a high light energy converse efficiency based on the oxidation-reduction reaction, the recombination of electron produced at the oxidation site and hole produced at the reduction site needs to be suppressed. Accordingly, the modification of metal with a similar band to promote electron movement is effective. By applying a vacuum field, the metal will stick only to the spherical reaction site. Therefore, palladium which is commonly used as the metal was examined as a material with separated oxidation and reaction site. Less